<template>
    <div>
        <el-breadcrumb separator-class="iconfont icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item><el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图区域 -->
    <el-card>
    <!--头部警告区域-->
      <el-alert
    title="注意：只允许为第三级分类设置相关参数"
    type="warning" :closable="false">
     </el-alert>

     <!--选择商品分类区域 -->
     <el-row class="cat_opt">
        <el-col>
            <span>选择商品分类：</span>
            <!--选择商品分类的级联选择框-->
             <el-cascader
    v-model="selectedCateKeys"
    :options="catelist"
    :props="cateProps"
    @change="handleChange"></el-cascader>
        </el-col>
     </el-row>

     <!-- tab页签区域-->
     <el-tabs v-model="activeName" @tab-click="handleTabClick">
     <!--添加动态参数面板-->
    <el-tab-pane label="动态参数" name="many">
    <!--添加参数 -->
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
        <!-- 动态参数表格 -->
        <el-table :data="manyTableData" border stripe>
        <!-- 展开行 -->
        <el-table-column type="expand">
        <template slot-scope="scope">
            <!-- 循环渲染Tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
            <!-- 输入文本框 -->
            <el-input
  class="input-new-tag"
  v-if="scope.row.inputVisible"
  v-model="scope.row.inputValue"
  ref="saveTagInput"
  size="small" 
  @keyup.enter.native="handleInputConfirm(scope.row)"
  @blur="handleInputConfirm(scope.row)"
>
</el-input>
             <!-- 添加按钮 -->
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

            </template></el-table-column>
        <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column prop="attr_name" label="参数名称"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                    <el-button type="primary" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                    <el-button type="primary" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
        </el-table>
     </el-tab-pane>
    <!--添加动态参数面板-->
    <el-tab-pane label="静态属性" name="only">
     <!--添加属性 -->
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true" >添加属性</el-button>
        <!-- 静态参数表格 -->
        <el-table :data="onlyTableData" border stripe>
        <!-- 展开行 -->
        <el-table-column type="expand">
            <template slot-scope="scope">
            <!-- 循环渲染Tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                <el-input
  class="input-new-tag"
  v-if="scope.row.inputVisible"
  v-model="scope.row.inputValue"
  ref="saveTagInput"
  size="small" 
  @keyup.enter.native="handleInputConfirm(scope.row)"
  @blur="handleInputConfirm(scope.row)"
>
</el-input>
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

            </template>
        </el-table-column>
        <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column prop="attr_name" label="属性名称"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                    <el-button type="primary" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                    <el-button type="primary" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-tab-pane>
  </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
  :title="'添加' + titleText"
  :visible.sync="addDialogVisible"
  width="50%" @close="addDialogClosed">
  <!-- 修改参数的对话框 -->
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>
<!-- 添加参数的对话框 -->
    <el-dialog
  :title="'修改' + titleText"
  :visible.sync="editDialogVisible"
  width="50%" @close="editDialogClosed">
  <!-- 添加参数的对话框 -->
  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
    </div>
</template>
<script>
export default {
   data() {
      return {
          //  商品分类列表
          catelist: [],
          // 级联选择框的配置属性
          cateProps: {
             expandTrigger: 'hover',
             value: 'cat_id',
             label: 'cat_name',
             children: 'children'
          },
        // 级联选择框双向绑定的数组
        selectedCateKeys: [],
        // 被激活的页签名称
        activeName: 'many',
        // 动态属性数据
        manyTableData: [],
        // 静态属性数据
        onlyTableData: [],
        // 控制添加对话框的显示与隐藏
        addDialogVisible: false,
        // 添加参数的表单数据对象
        addForm: {
            attr_name: ''
        },
        // 添加表单的验证规则对象
        addFormRules: {
            attr_name: [
                {
                    required: true, message:'请输入参数名称', trigger:'blur'
                }
            ]
        },
        // 控制修改对话框显示与隐藏
        editDialogVisible: false,
        // 修改的表单数据对象
        editForm: {},
        // 修改表单的验证规则对象
        editFormRules: {
            attr_name: [
                {
                    required: true, message:'请输入参数名称', trigger:'blur'
                }
            ]
        },
        // 控制按钮与文本框的切换显示
        inputVisible: false,
        // 文本框输入的内容
        inputValue:''


        
      }
   },
   methods: {
       // 获取所有的商品分类列表
    async  getCateList() {
        const {data: res} = await this.$http.get('categories')
        if(res.meta.status !== 200 ){
            return this.$message.error(' 获取商品分类失败')
        }

        this.catelist = res.data

       },
       // 级联选择框选中项变化，会触发这个函数
        handleChange() {
         this.getParamsData()
       },
       // tab页签点击事件名称
       handleTabClick() {
         console.log(this.activeName)  
         this.getParamsData()
       },
       // 获取参数的列表数据
      async getParamsData() {
             // 证明选中不是三级分类
          if(this.selectedCateKeys.length !== 3) {
            this.selectedCateKeys = []
            this.manyTableData = []
            this.onlyTableData= []
            return 
          }

        // 证明选中的是三级分类
          console.log(this.selectedCateKeys)
          console.log(this.cateId)
          console.log(this.activeName)
        // 根据所选分类Id，和所处面板，获取对应参数
       const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
           params: { sel: this.activeName}
           })

       if(res.meta.status !== 200) {
           return this.$message.error('获取参数失败！')
       }

       console.log(res.data)
       res.data.forEach(item => {
           item.attr_vals = item.attr_vals ? 
           item.attr_vals .split(' ') : []

           //控制文本框的显示与隐藏
           item.inputVisible =false
           // 文本框中输入的值
           item.inputValue = ''
        // (item.attr_vals || '').split(' ') 可能这样
       })

       if(this.activeName === 'many') {
           this.manyTableData = res.data
       }else {
           this.onlyTableData = res.data
       }
       },
       // 监听对话框的关闭事件
       addDialogClosed() {
           this.$refs.addFormRef.resetFields()
       },
       // 点击按钮，添加参数
       addParams() {
           this.$refs.addFormRef.validate(async valid => {
               if(!valid) return
             const {data: res} = await  this.$http.post(`categories/${this.cateId}/attributes`,{
                   attr_name: this.addForm.attr_name,
                   attr_sel: this.activeName
               })

               if(res.meta.status !== 201 ) {
                   return this.$message.error('添加参数失败！')
               }

               this.$message.success('添加参数成功')
               this.addDialogVisible = false
               this.getParamsData()
           })
       },
       // 点击按钮 展示修改对话框
       async showEditDialog(attr_id) {
           // 查询当前参数的信息
          const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
           {params: {attr_sel: this.activeName }
           })

           if(res.meta.status !== 200) {
               return this.$message.error('获取参数信息失败！')
           }
           this.editForm = res.data
           this.editDialogVisible = true
       },
       // 重置修改的表单
    editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮 修改参数信息
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if(!valid) return
              const {data: res} =  await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                })

                if(res.meta.status !== 200) {
                    return this.$message.error('修改参数失败！')
                }

                this.$message.success('修改参数成功！')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        // 根据Id删除对应的参数项
       async removeParams(attr_id) {
          const confirmResult =  await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        // 用户取消了删除的操作
        if(confirmResult !== 'confirm'){
            return this.$message.info('已取消删除！')
        }

        // 删除的业务逻辑
        const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

        if(res.meta.status !== 200) {
            return this.$message.error('删除参数失败！')
        }

        this.$message.success('删除参数成功！')
        this.getParamsData()
        },
        // 文本框失去焦点，或摁下了 Enter 都会触发
        async handleInputConfirm(row) {
            if(row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            console.log(row)
            // 输入了真实的内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 需要发起请求，保存这次请求
           this.saveAttrVals(row)
        },
        // 点击按钮，展示文本输入框
        showInput(row) {
            row.inputVisible = true
            // 让文本框自动保存
            //$nextTick 方法作用，就是当页面上元素被重新渲染之后，
            // 才会指定回调函数中的代码
            this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
        },
        // 将对attr_vals 的操作，保存到数据库
        async saveAttrVals(row) {
             const {data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200) {
                return this.$message.error('修改参数失败！')
            }

            this.$message.success('修改参数成功！')
        },
        // 删除对应的参数可选项
        handleClose(i, row) {
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        }

   },
   created() {
       this.getCateList()
   },
   computed: {
       // 如果按钮需要被禁用，则返回true，否则返回false
       isBtnDisabled() {
           if(this.selectedCateKeys.length !== 3) {
               return true
           }
           return false
       },
       // 当前选中的三级分类Id
       cateId() {
           if(this.selectedCateKeys.length ===3 ) {
               return this.selectedCateKeys[2]
           }

           return null
       },
       // 动态计算标题的文本
       titleText() {
           if(this.activeName === 'many') {
               return '动态属性' 
           }
           return '静态属性' 
       }
   }
}
</script>
<style scoped lang="less">
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 120px;
}
</style>
